级数∑(2/5)^(n+1)的和
还有∑(1→∞) 1/(2n-1)(2n+)1的和
人气:394 ℃ 时间:2020-06-22 22:44:04
解答
1)2/5第二个没看懂,能否写详细点1/(1*3)+1/(3*5)+1/(5*7)+……
=1/2(1/1-1/3+1/3-1/5+1/5-1/7+……)
=1/2
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